'Chicago P.D.' season 4 episode 7 spoilers: Team investigates eyewitness' murder; Antonio gets new job order to work for state attorney's office

The sole eyewitness in a crucial case against a suspected serial rapist is found murdered in the upcoming episode of NBC's procedural spin-off drama "Chicago P.D." season 4.
Titled "300, 000 Likes," the seventh episode will see the squad probe on the killing of an important eyewitness for an ongoing case. According to the official synopsis, Voight (Jason Beghe) gathers the whole team to look into a homicide involving the only witness in a rape and murder case against a young man named Oliver Tuxhorn (guest star Gus Halper).
As the investigation continues, Intelligence tries to learn more about Tuxhorn's family and their finances in an effort to determine if someone was paid to end the victim's life. Meanwhile, Stone (guest star Philip Winchester) offers Antonio (Jon Seda) a job to become the lead investigator for the state attorney's office. After pulling a man over, Burgess (Marina Squerciati) and Sorensen's (guest star Kevin Kane) body cameras are able to capture a strange exchange with the stranger.
The said episode will possibly see Antonio take the job offer from Stone, since it was previously reported that he will soon be a part of the latest installment of the "Chicago" franchise titled "Chicago Justice." Seda will exit the series in November to move to his new series, and episode 8 will mark his departure from "Chicago P.D."
Although having to say goodbye to a longtime series regular seems difficult, executive producer Michael Brandt said in an interview that "Chicago P.D." will also benefit from the move. "I think on P.D., creatively, we'd done a lot with Jon's character, we put his character through a lot personally," Brandt told The Hollywood Reporter. "So I think it was nice for us to give some more air to the other members of Intelligence on P.D. by removing a body. It also gives us some more screen time for some of the other actors on P.D. It serves a lot of purposes, it all made sense to us."
Keep tuning in to "Chicago P.D." season 4 airing every Wednesday night at 10 p.m. ET on NBC.